Fair Value Measurements - Summary of Level 3 Financial Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	$ 965,610	$ 967,846	$ 907,669
Investments at fair value	129,176		104,742
Loans at fair value	5,498		5,460
Other assets at fair value	190		194
Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	100,340		96,387
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	21,781	21,117	20,358
Loans at fair value	671	681	683
Other assets at fair value	190		194
Level 3 \| Trading cash instruments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading cash instrument at fair value	1,085	883	1,213
Level 3 \| Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	4,833	4,751	4,126
Level 3 \| Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	15,002	14,604	14,142
Level 3 \| Other assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets at fair value	$ 190	$ 198	$ 194

Fair value portion of assets or liabilities pertaining to principal and customer trading transactions

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Fair value portion of asset recognized for present right to economic benefit.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of other assets.

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